1 Features

1• 3.3-V, 5-V, and Adjustable Output Versions

• Adjustable Version Output Voltage Range: 1.2 V

to 57 V ±4% Maximum Over Line and Load

Conditions

• Ensured 2-A Output Load Current

• Available in 7-Pin TO-220 and TO-263 (Surface-

Mount) Package

• Input Voltage Range up to 60 V

• 150-kHz Fixed Frequency Internal Oscillator

• Shutdown and Soft-Start

• Out-of-Regulation Error Flag

• Error Flag Delay

• Low Power Standby Mode: IQ, Typically 90 μA

• High Efficiency

• Thermal Shutdown and Current-Limit Protection

2 Applications

• Simple High-Efficiency Step-Down (Buck)

Regulators

• Efficient Preregulator for Linear Regulators

• On-Card Switching Regulators

• Positive-to-Negative Converters

3 Description

The LM2593HV series of regulators are monolithic

integrated circuits that provide all the active functions

for a step-down (buck) switching regulator, capable of

driving a 2-A load with excellent line and load

regulation. These devices are available in fixed output

voltages of 3.3-V, 5-V, and an adjustable output

version.

This series of switching regulators is similar to the

LM2592HV with additional supervisory and

performance features.

Requiring a minimum number of external

components, these regulators are simple to use and

include internal frequency compensation, improved

line and load specifications, fixed-frequency oscillator,

Shutdown/Soft-start, output error flag, and flag delay.

The LM2593HV operates at a switching frequency of

150 kHz, thus allowing smaller sized filter

components than what would be needed with lower

frequency switching regulators. Available in a

standard 7-pin TO-220 package with several different

lead bend options, and a 7-pin TO-263 surface-mount

package.

Other features include a specified ±4% tolerance on

output voltage under all conditions of input voltage

and output load conditions, and ±15% on the

oscillator frequency. External shutdown is included,

featuring typically 90-μA standby current. Selfprotection

features include a two stage current limit

for the output switch and an overtemperature

shutdown for complete protection under fault

conditions.